Portable telephone



FIG. 1 is a front, top, and right side perspective view showing our new design for a portable telephone in full lines, with the broken line matter being for illustrative purposes only and forming no part of the claimed design;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a front, top, and right side perspective view of an alternative embodiment thereof in full lines, with the broken line matter being for illustrative purposes only and forming no part of the claimed design; and,

FIG. 6 is a front, top, and right side perspective view of an alternative embodiment thereof in full lines, with the broken line matter being for illustrative purposes only and forming no part of the claimed design. 

The ornamental design for a portable telephone, as shown and described. 